Redmax Reciprocator, Kawasaki TurboBlade, or the Maruyama Landscape Blade. Those tools cut the grass straight across like scissors or shears. You will want a straight bladed edger for sidewalks, driveways or patios. The shearing cutters are not to be used vertically to edge. Horizontal cutting only.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738